Use of classical adsorption models for description of methane adsorption under ambient temperature

PHYS 546

Wei Xing, xingwei@sdut.edu.cn, School of Chemical Engineering, Shandong University of Technology, No 12 Zhangzhou Road, Zibo, 255049, China, Xiaodong Dai, School of Chemistry and Chemical Engineering, China University of Petroleum, Bei'er Road 271, Dongying, 257061, China, and Zi-feng Yan, wpp6687@yahoo.com.cn, State Key Laboratory for Heavy Oil Processing, China University of Petroleum, Dongying 257061 China, Dongying, 257061, China.
Coke-based super active carbons (SAC) were prepared using chemical activation. Methane adsorptive capacity on the adsorbents was determined by self-made apparatus at ambient temperature. Relations between methane uptake and carbon structure factors, such as BET surface area, micropore diameter and bulk density, were intensively investigated.Optimization of synthesis process of methane adsorbents might result in a potential natural gas storage technique in energy and fuel industry. Classical adsorption models such as Freundlich, Langmuir and BET were used to correlate methane effective storage capacity on the adsorbents with storage pressure under ambient temperature. Results showed that the Freundlich and the Langmuir (monolayer adsorption) isothermal adsorption model agree with experiment data precisely, whereas the BET (multilayer adsorption) model deviates the experiment data obviously under high pressure. It indicated that methane monolayer adsorption occurred on the inner surface of adsorbents under storage conditions.
 

Poster Session
7:30 PM-10:00 PM, Wednesday, 13 September 2006 Moscone Center -- Hall D, Poster

Sci-Mix
8:00 PM-10:00 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Sci-Mix

Division of Physical Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006